https://leetcode.com/problems/crawler-log-folder

function minOperations(logs: string[]): number {
    let depth = 0;
    for(const log of logs) {
        switch(log) {
            case '../':
                if (depth > 0) depth--;
                break;
            case './':
                break;
            default:
                depth++;
        }
    }
    return depth;
};